本文關(guān)鍵詞： 封隔器 密封性能 防突結(jié)構(gòu) 力學分析 有限元分析　出處：《中國地質(zhì)大學(北京)》2015年碩士論文　論文類型：學位論文

【摘要】：水平井分段壓裂技術(shù)廣泛用于儲層薄、滲透率低的儲層改造,封隔器作為分段壓裂管柱中的核心工具,其密封性能的好壞將直接影響采收效率。本文針對橡膠筒的密封性能,對壓縮式封隔器的密封機構(gòu)進行研究。封隔器的核心是密封機構(gòu),文章首先對密封膠筒的端面斜角、外徑和高度提出了設(shè)計依據(jù),對其形狀和尺寸進行優(yōu)化;為避免膠筒端部突出,設(shè)計了兩種活動式的防突裝置;對密封膠筒的常用材料進行了性能對比,選取氫化丁腈橡膠為膠筒材料,為后續(xù)有限元分析做準備。接下來對密封膠筒的受力情況進行理論分析,對在已知工作壓差下,無防突裝置膠筒的接觸應(yīng)力的計算公式進行推導(dǎo);然后把膠筒的變形分為自由變形、約束變形和穩(wěn)定變形三個階段,分別從結(jié)構(gòu)特征和壓差兩方面入手,對坐封力的計算公式進行推導(dǎo)。由理論分析結(jié)果得出,適當增加支撐環(huán)直徑對可提高膠筒的接觸應(yīng)力有很大幫助。最后對膠筒的密封特性進行有限元分析,由于橡膠筒隨載荷的變化是非線性的,需要對其建立合理的橡膠材料本構(gòu)模型。本文采用的是Yeoh超彈性本構(gòu)模型,在完成建模、定義材料和確定邊界條件等前處理步驟后,重點分析了膠筒的形狀尺寸和坐封力的大小對膠筒壓縮距、膠筒與套管間接觸應(yīng)力的影響,以及防突措施對膠筒應(yīng)變和膠筒與套管間接觸應(yīng)力的影響。分析結(jié)果表明:膠筒的壓縮距和接觸應(yīng)力隨坐封力的增加而增大;在采取防突措施后,膠筒的肩部突出更小,產(chǎn)生的壓縮距和接觸應(yīng)力更大,可有效提高膠筒的密封性能。
[Abstract]:Horizontal well fracturing technology is widely used in reservoir reconstruction with thin reservoir and low permeability. As the core tool of segmented fracturing string, the sealing performance of Packer will directly affect the recovery efficiency. The sealing mechanism of compression Packer is studied. The sealing mechanism is the core of Packer. Firstly, the design basis for the angle, diameter and height of the end face of the cylinder is put forward, and the shape and size of the Packer are optimized. Two kinds of movable anti-outburst devices were designed in order to avoid sticking out of the end of the rubber tube, and the performance of the common materials of the sealing rubber cylinder was compared, and hydrogenated nitrile butadiene rubber was selected as the cylinder material. Then the stress of the sealant cylinder is analyzed theoretically, and the formula of contact stress of the rubber tube without outburst device is deduced under the known working pressure difference. Then, the deformation of rubber cylinder is divided into three stages: free deformation, restrained deformation and stable deformation. The formula for calculating the seat-seal force is derived from the structural characteristics and pressure difference, respectively. It is helpful to increase the contact stress of the rubber cylinder by increasing the diameter of the supporting ring properly. Finally, the sealing characteristics of the rubber cylinder are analyzed by finite element method, because the rubber cylinder is nonlinear with the change of load. It is necessary to establish a reasonable constitutive model of rubber material. The Yeoh superelastic constitutive model is used in this paper. After the pre-processing steps such as modeling, defining materials and determining boundary conditions are completed, The influence of the shape and size of the rubber cylinder and the size of the sealing force on the compression distance of the rubber cylinder and the contact stress between the cylinder and the casing are analyzed. The results show that the compression distance and contact stress increase with the increase of the sealing force, and the shoulder protruding is smaller after the anti-outburst measures are taken. The compression distance and contact stress are larger, which can effectively improve the sealing performance of rubber cylinder.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE931.2

【參考文獻】

相關(guān)期刊論文 前1條

1 杜常橋;李世民;呂宏茹;;封隔器膠筒應(yīng)力數(shù)值模擬與結(jié)構(gòu)優(yōu)化研究[J];斷塊油氣田;2008年02期

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本文編號：1529391